Dirty Book

The Dirty Book is a key item in Gregory Horror Show: Soul Collector. It is an adult magazine belonging to Gregory; it makes him terribly embarassed if anyone else is caught with it. It is first found in Catherine's room (if you spy on Catherine, it is revealed that she possibly took it from James) and is required as part of the puzzle to get Judgment Boy's soul; present it to Gregory to make the Self-Help Book appear in the Library.

After you first give it to Gregory, it can be retrieved from where he hid it in the Storeroom. From here, it is part of the puzzle to steal Angel/Devil Dog's soul. It must be taken from the Storeroom and given to Gregory shortly before he enters the Lounge at 6:30 PM, where Angel Dog is waiting for him. Doing so will cause Gregory to run off to rehide it in the same place, causing him to forget about cleaning the Lounge.

In episode 10 of The Bloody Karte, Gregory is seen reading an adult magazine in his room; supposedly, this is the source of of the Dirty Mag in the game. Like in the game, he tries to hide its presence from the others, especially James and Gregory Mama.